From the Upper Devonian of East Iran, fossil remains of three genera of brachythoracid arthrodires are described: Eastmanosteus sp., Holonema rugosum (Claypole), and Aspidichthys ingens (Koenen). This occurrence extends the range of distribution of the three genera, but like all others known is situated within the "tropics" of the Devonian. In Eastmanosteus, the levator capitis muscle attaches on both sides of the posteromedian cusp of the nuchal plate. The double sockets on the... Topics: Arthrodira, Paleontology -- Devonian, Paleontology -- Iran
byNitecki, Matthew H; Field Museum of Natural History
Ischadites elrodi (S. A. Miller, 1892) a Lower Middle Devonian receptacultid from Indiana is redescribed as a dasycladacean alga closely related to Silurian Ischadites koenigii Murchison, 1839 Topics: Ischadites elrodi, Paleontology -- Devonian, Paleontology -- Indiana Hartsville Region
byMcKinney, Frank K. (Frank Kenneth); Field Museum of Natural History; International Union of Geological Sciences. Project Ecostratigraphy; Kríz, Jirí Pavel; International Geological Correlation Programme. Project no. 53 "Ecostratigraphy"
Diverse and abundant fenestrate bryozoans occur in two Lower Devonian levels of reefal and perireefal limestones of Central Bohemia, within the type area for the Lower Devonian stages. The reefal deposits of the Koneprusy Limestone (Pragian) are characterized by greater abundance and diversity, with 29 species. A less abundant and, in large part, different fauna of 17 species is found in perireefal and basinal deposits of the younger Zlichov Limestone (Zlichovian). The two faunas have high... Topics: Paleontology -- Devonian Czech Republic Prague Basin, Bryozoa, Fossil -- Czechoslovakia Prague Basin
The basal unit of the Jefferson formation at the head of Spring Mountain Canyon, Lemhi County, Idaho contains the following fishes: a heterostracan, Psephaspis idahoensis n.sp., which is shown to belong to the Pteraspididae rather than the Drepanaspididae; the arthrodire, Holonema haiti n.sp., and undetermined arthrodires; an antiarch referred to the Astrolepididae indet.; and a spine possibly belonging to a holcephalian. The age is considered to be Middle Devonian, and the depositional... Topics: Fishes, Fossil -- Idaho Lemhi Range, Paleontology -- Devonian, Paleontology -- Idaho Lemhi Range